Henry disston



HENRY DISSTON, OF PHILADELPHIA, PENNSYLVANIA.

. Letters Patent' No. 79,213, dated Juice. 23, 1868.

IMPROVEMENT IN DEVICE POR HOLDING ROTARVGUTTBRS WHILE BEING GROUND tlgr rtrhnle tristan in iu tigres @sans nirnt mit mating raft uf its smite.

TO ALL 'WHM IT MAY OONCERN:

Be it known that I, HENRY DIsSCrONoi` Philadelphia., Pennsylvania, have invented an Improvement in Instruments for Holding Rotary Cutters while being Ground; and I do hereby declare the following to be a full, clear, and exact description of the same.

My invention relates to an improvement on'the cutter-grinder, for which Letters Patent of the United States were granted to N. F. Stone, `on the seventeenth day of April, 1866, and my ,improvement consists of. `certain devices, fully described hereafter, for holding and adjusting the cutter while it is applied to a grindstone, so that the teeth shall all be reduced to a uniform size and shape, and the truth ofthe cutter preserved.

In order to enable others skilled in the art to make anduse my invention, I will now proceed todescribe its construction and operation, reference' being had to the accompanying drawing which forms apart of this specification, and in whichi Figure 1 is a sectional view of my improved instrument for holding rotary cutters while bein-g ground, and

Figure 2 an inverted plan view.

From one end of au oblong metal frame, A, projects a handle, a, and at the opposite end is an adjustable slide, B, which is secured to the frame by a set-screw, Z, and carries at its lower end a roller, c.

On the under side of the frame, near its `rear end, are lugs, through which extends a pin, e, and on the latter turn rollers, ff, the openings in the lugs being elongated, so that the said pin', with its rollers, may be adjustedvcrtically, set-screws, t, serving to`secure`the pin after adjustment.

In lugsg, on the lower side of the frame, near th'e centre of the same, are recesses or bearings for the reception of the spindle X of a rotary cutter, Y, the latter,'in the present instance, beingV similar to those employed in saw-gumming machines. v

'A set-screw, n, passes through a slot in an elastic plate, h, and secures the .latter to the rear end ofthe frame, and at the lower end of the plateis a lip, z', for a purpose described hereafter. y

The shaft of thel cutter to be sharpened is introduced into the recesses or bearings in the lugs g.- The lip z' of the elastic plate L is made to catch against oneI of the teeth of the cutter, and the plate is adjusted and secured in such a position that on the instrument being applied tothe grindstone the outer edge of the lower most tooth of the cutter will be brought against the edge of the stone.

After the iii-st tooth has been ground to the required extent, the slideB 'is depressed until'the roller c is in y contact with the edge of the stone. The spindle X is now turned in the direction of its arrow, the endofA the plate h being forced back by the inclined side of the tooth against which it bears, until the straight edge of the tooth is brought in contact with thelip z', when another tooth will bc in a position to be ground on tlxeapplica# tion of the instrument to the stoneas before.

It will be evident that the'bevclimparted to the edge of the tooth will depend upon ythe extent to which the cutter is turned before applying the tooth tothe stone, the position of the cutter in this respect being regulated by adjustingthe plate z, while the length of the tooth will be determined by the position of the rollers, so that ait'er the adjustment of the plate and rollers all the teeth may be' ground to precisely the same size and bevel without its being necessary for the operator to exercise any further vcare than is required to apply the `instrument to the stone, and to turn the cutter as its 'teeth are successively ground.

' It is advisable that the'rollcrs ff, as well as the rollers c c, should be adjustable vertically from time to time, otherwise, as the cutter is reduced by grinding, the proper, bevel will not beimpartedto the ends of the teeth. I

I claim as my invention, and desire' to secure by Letters Patent, as an improvement on the Vaforesaidinvention of N: F. Stone- The frame A, arranged for the reception of the spindle o fa rotarywcutter, as set forth, in combination with the rear rollers f, and the vertically-adjustable roller c, substantially as and for the purpose specified.

In testimony whereof, I have signed my name to this specification in the presence of two subscribing witnesses.

HENRY DISSTON.

Witnesses W. H. MAURICE, A. H. SnonMAKnn. 

